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Property, Plant, and Equipment | 12 Months Ended
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Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [abstract] |
Property, Plant, and Equipment | Property, Plant and Equipment A reconciliation of the changes in the carrying amount of PP&E is as follows:
| Land | Coal generation | Gas generation | Renewable generation | Mining property and equipment | Assets under construction | Capital spares and other(1) | Total
Cost |  |  |  |  |  |  |  |
As at Dec. 31, 2018 | 94 |  | 5,937 |  | 1,964 |  | 3,286 |  | 1,338 |  | 200 |  | 383 |  | 13,202 |
Adjustments on implementation of IFRS 16 | — |  | — |  | — |  | (7) |  | (101) |  | — |  | — |  | (108) |
Additions | — |  | — |  | — |  |  | — |  | 407 |  | 115 |  | 522 |
Acquisitions (Note 4(R) and 4(T))(2) | — |  | 300 |  | — |  | — |  | — |  | 139 |  | — |  | 439 |
Disposals(3) | (2) |  | (389) |  | (260) |  | — |  | (34) |  | — |  | (19) |  | (704) |
(Impairment) reversals (Note 7) | — |  | 448 |  | — |  | (2) |  | (15) |  | — |  | — |  | 431 |
Revisions and additions to decommissioning and restoration costs (Note 23) | — |  | (62) |  | 11 |  | 2 |  | 26 |  | — |  | — |  | (23) |
Retirement of assets | — |  | (158) |  | (26) |  | (7) |  | (10) |  | — |  | — |  | (201) |
Change in foreign exchange rates | (1) |  | (63) |  | (40) |  | (17) |  | (3) |  | (4) |  | (6) |  | (134) |
Transfers(4) | — |  | 103 |  | 22 |  | 319 |  | 25 |  | (514) |  | 16 |  | (29) |
As at Dec. 31, 2019 | 91 |  | 6,116 |  | 1,671 |  | 3,574 |  | 1,226 |  | 228 |  | 489 |  | 13,395 |
Additions | — |  | — |  | — |  | — |  | — |  | 478 |  | 8 |  | 486 |
Acquisitions (Note 4(K)) | — |  | — |  | 1 |  | — |  | — |  | — |  | — |  | 1 |
Disposals | (2) |  | (1) |  | — |  | — |  | — |  | — |  | (2) |  | (5) |
Impairment (Note 7) | (9) |  | (69) |  | — |  | (2) |  | — |  | — |  | (1) |  | (81) |
Revisions and additions to decommissioning and restoration costs (Note 23) | — |  | 21 |  | (11) |  | 8 |  | 76 |  | — |  | — |  | 94 |
Retirement of assets | — |  | (35) |  | (12) |  | (7) |  | (3) |  | — |  | (1) |  | (58) |
Change in foreign exchange rates | (1) |  | (37) |  | 45 |  | (14) |  | (2) |  | — |  | 6 |  | (3) |
Transfers(4) | 17 |  | 142 |  | (263) |  | 33 |  | (29) |  | (211) |  | (120) |  | (431) |
As at Dec. 31, 2020 | 96 |  | 6,137 |  | 1,431 |  | 3,592 |  | 1,268 |  | 495 |  | 379 |  | 13,398 |
Accumulated depreciation |  |  |  |  |  |  |  |
As at Dec. 31, 2018 | — |  | 3,765 |  | 1,128 |  | 1,161 |  | 830 |  | — |  | 154 |  | 7,038 |
Adjustments on implementation of IFRS 16 | — |  | — |  | — |  | (3) |  | (43) |  | — |  | — |  | (46) |
Depreciation | — |  | 304 |  | 77 |  | 136 |  | 97 |  | — |  | 16 |  | 630 |
Retirement of assets | — |  | (158) |  | (23) |  | (3) |  | (6) |  | — |  | — |  | (190) |
Disposals(3) | — |  | (170) |  | (255) |  | — |  | (14) |  | — |  | — |  | (439) |
Impairment reversal (Note 7) | — |  | 297 |  | — |  | — |  | — |  | — |  | — |  | 297 |
Change in foreign exchange rates | — |  | (52) |  | (16) |  | (4) |  | (2) |  | — |  | (2) |  | (76) |
Transfers | — |  | 10 |  | (11) |  | (3) |  | (22) |  | — |  | — |  | (26) |
As at Dec. 31, 2019 | — |  | 3,996 |  | 900 |  | 1,284 |  | 840 |  | — |  | 168 |  | 7,188 |
Depreciation | — |  | 352 |  | 76 |  | 142 |  | 133 |  | — |  | 14 |  | 717 |
Retirement of assets | — |  | (31) |  | (10) |  | (6) |  | (4) |  | — |  | — |  | (51) |
Disposals | — |  | (1) |  | — |  | — |  | — |  | — |  | (1) |  | (2) |
Change in foreign exchange rates | — |  | (35) |  | 18 |  | (4) |  | (2) |  | — |  | 2 |  | (21) |
Transfers | — |  | — |  | (212) |  | — |  | (29) |  | — |  | (14) |  | (255) |
As at Dec. 31, 2020 | — |  | 4,281 |  | 772 |  | 1,416 |  | 938 |  | — |  | 169 |  | 7,576 |
Carrying amount |  |  |  |  |  |  |  |
As at Dec. 31, 2018 | 94 |  | 2,172 |  | 836 |  | 2,125 |  | 508 |  | 200 |  | 229 |  | 6,164 |
As at Dec. 31, 2019 | 91 |  | 2,120 |  | 771 |  | 2,290 |  | 386 |  | 228 |  | 321 |  | 6,207 |
As at Dec. 31, 2020 | 96 |  | 1,856 |  | 659 |  | 2,176 |  | 330 |  | 495 |  | 210 |  | 5,822 |
(1) Includes major spare parts and stand-by equipment available, but not in service, and spare parts used for routine, preventive or planned maintenance, and the Australian gas pipeline. (2) 2019 includes $308 million related to the acquisition of the Keephills 3 facility with $300 million included in coal generation and the remainder in assets under construction. (3) In 2019, we sold the Genesee 3 facility and sold the major components of the Mississauga facility. In addition, Centralia sold boiler parts included in capital spares and other for a net loss of $17 million. The Highvale mine also sold trucks included in mining property and equipment for a net loss of $18 million. Both were recognized in other gains on the statement of earnings (loss). (4) 2020 transfers out of PP&E mainly relate to removing the Southern Cross assets from PP&E to a finance lease receivable and moving the Pioneer Pipeline and mine equipment to assets held for sale. 2020 transfers between the classifications of PP&E relate to the Centralia land purchase, the Sundance Unit 6 conversion to gas, the WindCharger project and planned major maintenance. 2019 transfers mainly relate to transferring the Pioneer Pipeline and US Wind Projects from assets under construction to coal generation and renewable generation, respectively. Additions in 2020 included cash additions related to the conversions to gas of $93 million, the Windrise wind project of $156 million, the WindCharger battery storage project of $6 million, the Kaybob cogeneration project of $31 million, Centralia mine land of $17 million and planned major maintenance expenditures. Additions in 2019 included cash additions of $417 million (including $169 million related to the construction of the US Wind Projects), $100 million related to the Pioneer Pipeline (including $15 million transferred from other assets) and $5 million related to the Keephills 3 and Genesee 3 asset swap. Refer to Note 4 for further details of these transactions. Depreciation expense increased mainly as a result of decisions to accelerate the Highvale mine shutdown to align with our conversion to gas plans, reflecting our transition away from coal. Depreciation expense also increased due to the Keephills 3 and Genesee 3 swap, the reversal of the impairment at Centralia and the changes in useful lives, all of which were effective in the second half of 2019. For further details on these changes, refer to Note 3(A)(III) and Note 4(R). In 2020, the Corporation capitalized $8 million (2019 — $6 million) of interest to PP&E in at a weighted average rate of 6.0 per cent (2019 —5.9 per cent).

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